Dry Fertilizers - which ones go together & which don't?

I was planning on switching to making up my own fertilizers from dry. I just noticed in another post where Hoppy mentioned that you shouldn't mix phosphorus and iron together in the same fertilizer mix because they will produce an insoluble precipitate.

Are there other combinations to avoid besides phosphorus and iron?

I'd like to get down to just one or two bottles to dose a day. Currently I'm dosing flourish comp, flourish iron, flourish potassium and excel. I don't dose phosphorus due to using Neutral Regulator which is a phosphorus based buffer.

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